|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Mechanical Behavior of Nanostructured Materials
||Microstructures and Mechanical Properties of Nanostructured and Ultrafine Grained Al Alloy and Cu Matrix Nanocomposites Fabricated by Thermomechanical Powder Consolidation
||Deliang Zhang, Dengshan Zhou, Xun Yao, Jiamiao Liang, Wei Zeng, Charlie Kong, Paul Munroe
|On-Site Speaker (Planned)
Nanostructured powders were made by high energy mechanical milling of mixtures of Al alloy chips or Cu powder and SiC or Al2O3 nanoparticles. The mechanically milled powders were consolidated by powder compact extrusion to fabricate bulk nanostructured or ultrafine grained Al alloy and Cu matrix nanocomposites. The ceramic nanoparticles play a critical role in controlling the recrystallization and grain growth during extrusion. The large area of grain boundaries and Al/SiC interfaces work as effective sinks for vacancies during quenching, and thus prevent formation of a large number density of precipitates for age hardening. Grain boundary strengthening makes a major contribution to the strength, and it is still not clear whether the ceramic nanoparticles, especially those at the grain boundaries significantly contribute to the strengthening. The state and strength of interparticle boundaries have significant influence on the tensile ductility and fracture behavior of this type of materials.
||Planned: Supplemental Proceedings volume